Abstract: Taken a rock slope of an open-pit mine as an project background, the stress evolution and the law of deformation on the excavation direction of rock slope during the excavation process was simulated by FLAC3D. The result shows that the stability of hanging slope in the mining is poorer, each step of rock mass excavation are destructive disturbance. It is likely that the destruction along the steps occurs and the overall stability loses, putting forward the programs of cutting slope and reducing load slope, and using the limit equilibrium method to analysis of slope stability after management to ensure the safety of open-pit mine production.

Key words: Slope treatment, Safety evaluation, Stability, Numerical simulation